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CHAPTER 17 SERIAL INTERFACE CHANNEL 1
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(3) Communication operation
(a) Basic transmit/receive mode
This transmit/receive mode is the same as the 3-wire serial I/O mode in which specified number of data are
transmitted/received in 8-bit units.
Serial transfer starts when any data is written to the serial I/O shift register 1 (SIO1) while the serial operating
mode register 1 (CSIM1) bit 7 (CSIE1) is set to 1.
Upon completion of transmission of the last byte, the interrupt request flag (CSIIF1) is set. However, the
termination of automatic transmission/reception should be judged by using bit 3 (TRF) of the automatic data
transmit/receive control register (ADTC), not CSIIF1.
If busy control and strobe control are not executed, the P23/STB and P24/BUSY pins can be used as normal
input/output ports.
Figure 17-7 shows the basic transmit/receive mode operation timings, and Figure 17-8 shows the operation
flowchart. In addition, Figure 17-9 shows the buffer RAM operation in 6-byte transmission/reception.
Figure 17-7. Basic Transmit/Receive Mode Operation Timings
Cautions 1. Because, in the basic transmit/receive mode, the automatic transmit/receive function
writes/reads data to/from the buffer RAM after 1-byte transmission/reception, an
interval is inserted until the next transmission/reception.
As the buffer RAM write/read is performed at the same time as CPU processing, the
maximum interval is dependent upon CPU processing (see (5) Automatic data
transmit/receive interval).
2. When TRF is cleared, the SO1 pin becomes low.
Remark CSIIF1 : Interrupt request flag
TRF
: Bit 3 of the automatic data transmit/receive control register (ADTC)
SCK1
SO1
SI1
CSIIF1
TRF
Interval
D7 D6 D5 D4 D3 D2 D1 D0
D7 D6 D5 D4 D3 D2 D1 D0
D7 D6 D5 D4 D3 D2 D1 D0
D7 D6 D5 D4 D3 D2 D1 D0
Summary of Contents for 78014Y Series
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Page 472: ...www DataSheet4U com CHAPTER 18 INTERRUPT FUNCTIONS AND TEST FUNCTION 472 MEMO...
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